Originally Posted by Ray N
Are the boat seats mounted in any way or just sitting on top?
The ball-bearing swivel bases are bolted thru the locker top and also thru a 1/2" plywd reinforcement pad inside the locker. Limit of width of the plywood is the width on the diagonal of the locker opening underneath (about 34" on both sides and the depth is whatever it takes to have reinforcement out near the edge of the locker deck where
rigidity is contributed by the flanges formed with vertical surfaces of the liner. I first thought to adhere the plywd to the underside of the locker decks with Liquid Nails and made dead men and wedges to hold the plywd up while I drilled and bolted the swivels, then moved these to the perimeter of the plywd for support while the LN cured. I didn't clean the glass inside with acetone and the reinforcement on the driver's side let go the first time I sat down. I already had a backup plan: 1/4" carriage bolts thru the glass deck and plywd at 5 locations around the perimeter. No flex or danger of cracking now. The seats are the cheapest boat seat you will find at Eastern Marine; cushions by WallyWorld.
Sag in large horizontal surfaces is a repeating theme in the Burro
. When I worked on glass sailing cruisers, we backed up horizontal surfaces with sheets of end-grain balsa and more glass or solid glass sheet reinforcement. None of that here. Found the same problem in the overhead lockers in galley. I could see the sag caused by the range hood. As I wanted to suspend microwave
next door, I used aluminum extrusions as stiffeners inside the lockers thru which to bolt the microwave
. Despite suspending another 29# from that surface, the sag is gone and the range hood parallels the countertop beneath. Same with the galley countertop. Also sagging in the transverse direction and showing big gap at sink flange and gas range. I will resort to the same solution for that; aluminum u-channel as a stiffener inside from front to back of cntrtp and in this case stainless carriage bolts to attach as there is always moisture near sink. It might be that good surface prep to undersurfaces (abrasion, acetone cleaning) would allow the use of thickened epoxy to mount these stiffeners but I'm happy enuf with the few carriage bolt heads which are exposed.